Landa NG-3000, Operator'S Manual

Page: 11 / 30

11
Operations
Union Location
A 1/8" N.P.T. plugged tapping accessible for test gauge
connection shall be installed immediately upstream of
the gas supply connection for the purpose of deter -
mining gas supply pressure to the burner, and to
prevent damage to gas valve.
If a manual gas shut off valve is not in the gas supply
line within six feet of the machine and in an accessible
location, one shall be installed.
A manual shut-off valve shall be installed in the gas
supply line external to the appliance. See Figure 2. The
gas line should be a separate supply direct from the
meter to the burner. It is recommended that new pipe
be used and located so that a minimum amount of work
will be required in future servicing. The piping should be
so installed as to be durable, substantial and gas tight.
It should be clear and free from cutting burrs and
defects in structure of threading. Cast iron fittings or
aluminum tubing should not be used for the main gas
circuit. Joint compounds (pipe dope) should be used
sparingly on male threads only and be approved for all
gases.
Propane Gas
The following pipe and stack sizes are just recommen -
dations. Always consult a local plumber and venting
contractor for local codes and regulations during instal -
lation.
The following tables are maximum capacity of final
stage pipe in thousands of Btu/hr of commercial
propane
From first stage regulator (at tank) to second stage
regulator
The chart below is based on incoming gas pressure of
10 PSI and a pressure drop of 1 PSI. Numbers are for
straight schedule 40 pipe; fittings further reduce
capacity.
Length of Pipe
(ft.)
Iron Pipe Size
1/2" 3/4"
10 3339 6982
20 2295 4799
30 1843 3854
40 1577 3298
50 1398 2923
60 1267 2649
70 1165 2437
80 1084 2267
90 1017 2127
100 961 2009
150 772 1613
200 660 1381
250 585 1224
300 530 1109
350 488 1020
400 454 949
450 426 890
500 402 841
Landa NG 3000 Operator’s Manual 8.913-942.0 - E
Location of union and drip
leg for connecting conversion
burner to house piping
Floor Level
1/8 in. N.P.T. Plugged
Pressure Gauge Port
Flow
Union
Control Manifold
Manual
Shut-off
Valve
Tee
3 in. (76.2 mm)
MINIMUM
Pipe Cap